Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D19/00—Casting in, on, or around objects which form part of the product
  • B22D19/0009—Cylinders, pistons
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D19/00—Casting in, on, or around objects which form part of the product
  • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads

Definitions

• Cylinder head for an internal combustion engine comprising a reinforcement element
• the present invention relates to a cylinder head for an internal combustion engine.
• the cylinder heads of internal combustion engines are generally made of aluminum alloy.
• the cylinder head adjacent to the combustion chamber is subjected to pressures of up to 200 bar generating considerable bending forces to which are added thermal stresses due to the high temperatures prevailing in the combustion chamber.
• FR2671310 and 2682899 disclose internal combustion engine cylinder heads having improved resistance to the aforementioned stresses.
• the solutions described in the documents above consist in making the cylinder head by successive casting of two different alloys.
• the object of the invention is to create a cylinder head for an internal combustion engine, made of aluminum alloy having a significantly increased resistance to the mechanical and thermal stresses mentioned above.
• a cylinder head characterized in that it comprises a perforated element extending near the face of the cylinder head adjacent to the combustion chamber, this perforated element being completely coated with the aluminum alloy of the cylinder head and being made of a material having a higher bending strength than said aluminum alloy.
• the perforated element above reinforces in particular with respect to the bending forces it undergoes during the operation of the engine, the part of the yoke called tablature which is adjacent to the combustion chamber.
• the perforated element is made of steel and is constituted by a grid or a lattice.
• This grid or mesh preferably extends parallel to the face of the cylinder head adjacent to the combustion chamber.
• This grid or mesh, steel or other high-strength alloy is thus separated from said face by a constant aluminum alloy thickness.
• said lattice extends over substantially the entire length and width of the yoke.
• said lattice reinforces with respect to the bending and thermal forces, the entire part of the yoke that is adjacent to the combustion chamber.
• said mesh extends between the intake and exhaust ducts and the passages for the cooling liquid made in the cylinder head and said face adjacent to the combustion chamber.
• said lattice is separated from said ducts, passages and said face by an aluminum alloy thickness at least equal to the thickness of said lattice.
• said lattice comprises recesses surrounding the exhaust and intake ducts, the fuel injector and the glow plug.
• the lattice is composed of parallel bars extending along the length of the bolt, of bars parallel extending along the width of the yoke and parallel bars extending along diagonals.
• the bars have a smaller thickness in the plane of the lattice than in a direction perpendicular to this plane.
• FIG. 1 is a cross-sectional view of a yoke comprising a lattice-shaped perforated element
• FIG. 2 is a plan view of the lattice
• FIG. is a perspective view of a portion of the lattice
• FIG. 4 is a perspective view of a portion of the yoke in which the lattice is embedded
• FIG. 5 is a sectional view of the detail A of FIG. .
• Figure 1 shows in section the cylinder head 1 of an internal combustion engine, made of aluminum alloy, in particular a diesel direct injection engine.
• This yoke 1 comprises a perforated element 2 extending near the face 3 of the yoke adjacent to the combustion chamber.
• This perforated element 2 is completely covered by the aluminum alloy of the yoke 1 and is made of a material such as steel having a higher bending strength than the aluminum alloy constituting the yoke 1.
• the perforated element 1 is a lattice that can be cut or stamped into a steel plate or be molded.
• FIG. 1 shows that the lattice 2 extends parallel to the face 3 of the yoke 1, adjacent to the combustion chamber and extends over substantially the entire length and width of the yoke 1.
• the mesh 2 extends between the intake ducts 4 and exhaust 5 and the passages 6, 7, 8 for the cooling liquid made in the cylinder head and the face 3 adjacent to the combustion chamber.
• the lattice 2 is separated from the ducts 4, 5, passages 6, 7, 8 and from the face 3 by an aluminum alloy thickness at least equal to the thickness of the lattice 2.
• FIGS. 2 and 4 show, on the other hand, that the mesh 2 comprises circular recesses 9, 10, 11, 12, 13 intended to surround the exhaust and intake ducts, the fuel injector and the spark plug. preheating.
• the lattice is composed of parallel bars 14 extending along the length of the yoke, parallel bars 15 extending along the width of the yoke and parallel bars 16, 17 extending following diagonals.
• the bars 14, 15, 16 and 17 have a smaller thickness in the plane of the lattice 2 than in a direction perpendicular to this plane.
• the molten alloy completely covers the bars 14 to 17 of the mesh 2 and completely fills the openings, that is to say the spaces between the bars.
• the steel mesh 2 reinforces with respect to the bending forces the tablature of the cylinder head and prevents the cracking thereof, despite the strong mechanical and thermal stresses it undergoes in the case of an engine whose power can to reach 80 KW per liter of displacement.
• the mesh 2 may also be made of another alloy with high strength than steel.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Luminescent Compositions (AREA)
• Ultra Sonic Daignosis Equipment (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37814187

Family Applications (1)

Country Status (6)

Citations (4)

Family Cites Families (5)

• 2006
  • 2006-07-18 FR FR0606526A patent/FR2904052B1/fr not_active Expired - Fee Related
• 2007
  • 2007-06-26 EP EP07803942A patent/EP2041417B1/fr not_active Not-in-force
  • 2007-06-26 DE DE602007003985T patent/DE602007003985D1/de active Active
  • 2007-06-26 AT AT07803942T patent/ATE453044T1/de not_active IP Right Cessation
  • 2007-06-26 JP JP2009520017A patent/JP2009543979A/ja active Pending
  • 2007-06-26 WO PCT/FR2007/051523 patent/WO2008009834A1/fr active Application Filing

Patent Citations (4)

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